J/AJ/130/1097 BHB stars in Century Survey Galactic Halo Project (Brown+, 2005)
The Century Survey Galactic Halo Project.
II. Global properties and the luminosity function of field blue horizontal
branch stars.
Brown W.R., Geller M.J., Kenyon S.J., Kurtz M.J., Allende Prieto C.,
Beers T.C., Wilhelm R.
<Astron. J., 130, 1097-1110 (2005)>
=2005AJ....130.1097B 2005AJ....130.1097B
ADC_Keywords: Stars, blue ; Stars, horizontal branch ; Photometry, SDSS ;
Photometry, infrared
Keywords: Galaxy: halo - Galaxy: stellar content - stars: horizontal-branch
Abstract:
We discuss a 175°2 spectroscopic survey for blue horizontal branch
(BHB) stars in the Galactic halo. We use the Two Micron All Sky Survey
(2MASS, II/246) and the Sloan Digital Sky Survey (SDSS) to select BHB
candidates, and we find that the 2MASS and SDSS color selection is 38%
and 50% efficient, respectively, for BHB stars. Our samples include
one likely runaway B7 star 6kpc below the Galactic plane.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 66 257 Photometry
table3.dat 75 257 Spectroscopic and stellar parameters
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See also:
http://www.sdss.org : The Sloan Digital Sky Survey home page
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/AJ/126/1362 : Century Survey Galactic Halo Project. I. (Brown+, 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [CHSS]
6- 9 I4 --- CHSS Source identifier (G1)
11- 12 I2 h RAh Hour of Right Ascension (J2000)
14- 15 I2 min RAm Minute of Right Ascension (J2000)
17- 20 F4.1 s RAs Second of Right Ascension (J2000)
22 A1 --- DE- Sign of the Declination (J2000)
23 I1 deg DEd Degree of Declination (J2000)
25- 26 I2 arcmin DEm Arcminute of Declination (J2000)
28- 29 I2 arcsec DEs Arcsecond of Declination (J2000)
31- 35 F5.2 mag Jmag ? 2MASS extinction-corrected J band magnitude
37- 41 F5.3 mag e_Jmag ? Uncertainty in Jmag
43- 47 F5.2 mag g'mag ? SDSS extinction-corrected g' band magnitude
49- 53 F5.3 mag e_g'mag ? Uncertainty in g'mag
55- 58 F4.2 mag E(B-V) Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S)
reddening value
60- 64 F5.2 mag B-V Predicted (B-V) color (2)
66 I1 --- BHB [0/1] Blue Horizontal Branch status (3)
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Note (2): From 2MASS or SDSS photometry and Balmer line strengths
(Brown et al., 2003AJ....126.1362B 2003AJ....126.1362B).
Note (3): value 1 = is a BHB star, 0 = is not a BHB star.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [CHSS]
6- 9 I4 --- CHSS Source identifier (G1)
11- 15 F5.2 0.1nm KP ? The KP (Ca II) index
17- 21 F5.2 0.1nm HP2 ? The HP2 (Hδ) index
23- 26 F4.2 0.1nm GP ? The GP (G-Band) index
28- 33 F6.1 km/s HRV Heliocentric radial velocity
35- 38 F4.1 km/s e_HRV Uncertainty in HRV
40- 43 F4.1 --- SpType Spectral type code (2)
45- 47 F3.1 --- e_SpType Uncertainty in SpType
49- 52 I4 K Teff Effective temperature
54- 57 F4.2 [cm/s2] log(g) Log of the surface gravity
59- 63 F5.2 [Sun] [Fe/H] ? Log of Fe/H ratio relative to the Sun
65- 69 F5.2 kpc Dist Estimated distance
71- 75 F5.2 mag VMAG Absolute V band magnitude (3)
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Note (2): Where B0=10, A0=20, F0=30, and so forth.
Note (3): Corrected for reddening, given the estimated distance.
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Global notes:
Note (G1): The designation CHSS stands for Century Halo Star Survey
and is chosen to be unique from previous surveys.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 11-Oct-2005